A sharp knife cuts vegetables and fruits more effectively than blunt knife. Explain
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A sharp knife has a very thin edge to its blade. A sharp knife cuts objects better because due to its very thin edge, the force of our hand falls over very small area of the object producing a large pressure. And this large pressure cuts the object easily. On the other hand, a blunt knife has a thicker edge. A blunt knife does not cut an object easily because due to its thicker edge, the force of our hand falls over a larger area of the object and produces lesser pressure. This lesser pressure cuts the object with difficulty
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Because sharp edge will shear the surface of the object better than a blunt edge. The sharp edge has smaller surface area and imparts greater pressure for the same applied force. It’s practical in life as well. Try it at your home, take a sharp knife from the kitchen and try to cut some vegetable with it and observe the pressure that you applied. Now take a blunt knife and repeat the same. You'd observe that the sharp knife required lesser force to cut the object and the cut was clean while the cut with the blunt knife would be rough and would require more pressure to cut. Now repeat the experiment with a razor blade, it would require a lesser force than the sharp knife.
P=F/A
The lesser the area, the higher will be the pressure developed due to the applied force. Less applied force means greater efficiency, as you'd be able to work for longer period.
Here is your answer
Because sharp edge will shear the surface of the object better than a blunt edge. The sharp edge has smaller surface area and imparts greater pressure for the same applied force. It’s practical in life as well. Try it at your home, take a sharp knife from the kitchen and try to cut some vegetable with it and observe the pressure that you applied. Now take a blunt knife and repeat the same. You'd observe that the sharp knife required lesser force to cut the object and the cut was clean while the cut with the blunt knife would be rough and would require more pressure to cut. Now repeat the experiment with a razor blade, it would require a lesser force than the sharp knife.
P=F/A
The lesser the area, the higher will be the pressure developed due to the applied force. Less applied force means greater efficiency, as you'd be able to work for longer period.
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